How to add class at checkbox in cakePHP 2.0?

How to add class at check box.?

Code

echo $this->Form->select('user_list', $user_options, array(

'multiple' => 'checkbox',

'name' => 'data[GroupUser][user_id]',

'class' => 'validate[maxCheckbox[1]]',));

output:-

<div class="validate[maxCheckbox[1]]"><input type="checkbox" id="GroupUserList1" value="1" name="data[GroupUser][user_id][]"><label for="GroupUserList1">rahim basheer</label></div>

<div class="validate[maxCheckbox[1]]"><input type="checkbox" id="GroupUserList3" value="3" name="data[GroupUser][user_id][]"><label for="GroupUserList3">ram kumar</label></div>

<div class="validate[maxCheckbox[1]]"><input type="checkbox" id="GroupUserList5" value="5" name="data[GroupUser][user_id][]"><label for="GroupUserList5">riyas khan</label></div>

<div class="validate[maxCheckbox[1]]"><input type="checkbox" id="GroupUserList6" value="6" name="data[GroupUser][user_id][]"><label for="GroupUserList6">ramesh krishna</label></div>

I need the following format of output:-

<div><input class="validate[maxCheckbox[1]]" type="checkbox" id="GroupUserList1" value="1" name="data[GroupUser][user_id][]"><label for="GroupUserList1">rahim basheer</label></div>

<div><input class="validate[maxCheckbox[1]]" type="checkbox" id="GroupUserList3" value="3" name="data[GroupUser][user_id][]"><label for="GroupUserList3">ram kumar</label></div>

<div><input class="validate[maxCheckbox[1]]" type="checkbox" id="GroupUserList5" value="5" name="data[GroupUser][user_id][]"><label for="GroupUserList5">riyas khan</label></div>

<div><input class="validate[maxCheckbox[1]]" type="checkbox" id="GroupUserList6" value="6" name="data[GroupUser][user_id][]"><label for="GroupUserList6">ramesh krishna</label></div>

Thanks 

Kushal

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